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Build A Hash Tree From Array Of File Names In Ruby

10.27.2010
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["a", "a/b", "a/b/c", "b/c", "b/d"].inject({}) {|h,i| t = h; i.split("/").each {|n| t[n] ||= {}; t = t[n]}; h}
=> {"a"=>{"b"=>{"c"=>{}}}, "b"=>{"c"=>{}, "d"=>{}}}